[msbuild] Copy inputs to the remote Mac in the CompileNativeCode task.

They may not exist on the Mac, if they were produced locally on Windows.

Author: rolfbjarne

msbuild/Xamarin.MacDev.Tasks/Tasks/CompileNativeCode.cs

@@ -156,7 +156,7 @@ public override bool Execute ()
 			return !Log.HasLoggedErrors;
 		}
 
-		public bool ShouldCopyToBuildServer (ITaskItem item) => false;
+		public bool ShouldCopyToBuildServer (ITaskItem item) => true;
 
 		public bool ShouldCreateOutputFile (ITaskItem item) => true;